It was very close at that time. Bill Tilden and Hans Nusslein were the first professional players to be neck and neck with the top amateur players. If forced to make a choice for the best male player of 1933, I pick Jack Crawford. He was really unfortunate to lose that final and a big place in tennis history.

He lost because his friends mistakenly thought he would benefit from alcoholic beverages (he had minor asthma), and laced his drinks with alcohol. By the end of the third set he was unwittingly drunk and unable to play.
If they had left him alone, he would have won.